考虑路面不平整度因素的车路耦合系统非线性数值模型

发布时间：2018-06-01 19:50

本文选题：道路工程 + 非线性模型　；参考：《公路交通科技》2017年08期

【摘要】：利用有限元方法以车路耦合系统作为研究对象,开展路面不平整度影响下的车路耦合非线性数值模拟研究,建立了考虑路面不平整度因素的车路耦合非线性数值模型,包括车辆系统、道路系统、车辆与道路的接触3大部分,并模拟车辆行驶和轮胎的跳起等。在非线性模型计算过程中,设定车辆模型在道路表面以某一设定速度匀速运动,并利用道路不平整度频谱进行Fourier逆变换得到时域模拟的路面不平整度数值,以研究路面不平整度激励下车路耦合振动。研究所得主要结论:(1)在随机性路面不平整度影响下,通过对车路耦合非线性动力模型的计算结果数值以及动力模型所反映振动趋势的验证,得出该模型能较好地反映车路耦合作为一个大系统的振动情况,计算结果可信,具有较高的工程应用价值。(2)路面不平整度越差路面产生的振动位移也越大,算例显示同样条件下C级路面下的最大位移量是A级路面的1.31倍,但路面振动频率受不平整度的影响不明显。
[Abstract]:Taking the vehicle-road coupling system as the research object, the nonlinear numerical simulation of the vehicle-road coupling under the influence of road roughness is carried out by using the finite element method, and the vehicle-road coupling nonlinear numerical model considering the road roughness is established. It includes three parts: vehicle system, road system, vehicle and road contact, and simulates vehicle running and tire jumping. In the process of nonlinear model calculation, the vehicle model is set to move uniformly at a certain speed on the road surface, and the road roughness value is obtained by using the Fourier inverse transform of road irregularity spectrum in time domain. In order to study the road surface unevenness and drive the coupling vibration of the alightway. Conclusion: 1) under the influence of random road roughness, the numerical results of the vehicle-road coupling nonlinear dynamic model and the vibration trend reflected by the dynamic model are verified. It is concluded that the model can better reflect the vibration of the vehicle-road coupling as a large system, and the calculation results are credible and have higher engineering application value. 2) the worse the road surface roughness is, the greater the vibration displacement will be. The numerical examples show that the maximum displacement of C class pavement is 1.31 times that of A grade pavement under the same condition, but the vibration frequency of the pavement is not affected by the unevenness obviously.
【作者单位】：北方工业大学土木工程学院;
【分类号】：U416.2;U461.51

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